The puzzles are both fun and educational, providing hours of entertainment for the entire family. Made using linen paper with an anti-glare coat for a perfect look, and thick and sturdy European Blue Board of the highest quality (2mm), this puzzle is 100% recyclable, environmentally friendly, and non-toxic. Using Smart-Cut Technology, Eurographics Puzzles has been able to create a multitude of unique and unusual shapes which fit together perfectly. Because no two pieces are alike, making your puzzling both challenging and stimulating.